A wireless device receives, in a first subframe, a media-access-control control element (MAC CE) comprising at least one parameter instructing the wireless device to activate at least one licensed cell and at least one LAA cell. The wireless device performs channel monitoring on the at least one LAA cell before a first maximum number of subframes after the first subframe. The wireless device performs channel monitoring on the at least one licensed cell before a second maximum number of subframes after the first subframe. The first maximum number of subframes and the second maximum number of subframes are different.